Better navigate to McAfee Agent > Repository policy setting. Where you can define agent update settings to particular Agent Handler / Super Agent or ePO server.
Ping time is the best option for updates.
So I assume if I want to force certain regions to get updates from specific superagents, I will have to duplicate the repository policy, change the order of the superagents and apply that policy to those regions, correct?
That's correct. If you want to 100% guarantee that a particular agent uses a specific repository, you need to give it a user-defined list containing the exact repos you want.
The other options allow the agent to determine its own repository order, and - whilst normally pretty effective and accurate - there will always be cases where the agent may not choose the repo you want it to.